Lining coating technology for spheroidal graphite cast iron tube

A technology of ductile iron pipe and centrifugal ductile iron, which is applied in the direction of coating, the device for coating liquid on the surface, etc., can solve the problems of easy falling off and influence of the lining layer, and achieve the effect of reducing the possibility

Active Publication Date: 2014-04-02
广西安钢永通铸管管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a ductile iron pipe lining process that solves the problems of the existing ductile iron pipe lining process that the liner is easy to fall off, which affects the normal installation, the use of metering equipment, and water quality sanitation, and reduces the inner liner. manufacturing cost

Method used

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  • Lining coating technology for spheroidal graphite cast iron tube
  • Lining coating technology for spheroidal graphite cast iron tube
  • Lining coating technology for spheroidal graphite cast iron tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The ductile iron pipe lining process, the specific steps are:

[0039] In the first step, the inner wall of the rough pipe of the ductile iron pipe is ground and shot blasted. Among them, after grinding, use the dust suction device to absorb the dust generated by grinding into the storage container for collection. The grinding standard is to make the inner wall of the pipe smooth without burrs and pits, so that the inner surface of the cast rough pipe meets the requirements of the inner wall of the lining and is smooth. The polished pipe is shot blasted on the inner wall. The standard is to remove the floating dust, rust (powder) and oxide layer after grinding to meet the requirements of the inner lining. In this embodiment, the blank pipe material is a water-cooled metal type centrifugal ductile iron pipe.

[0040] In the second step, the processed pipe 4 is placed on the supporting wheel 101 of the rotating platform 1 of the coating equipment by means of a transfer t...

Embodiment 2

[0047] The ductile iron pipe lining process, the specific steps are:

[0048] In the first step, the inner wall of the rough pipe of the ductile iron pipe is ground and shot blasted. In this embodiment, the blank pipe material is a resin sand molded centrifugal ductile iron pipe, and its manufacturing process belongs to the prior art.

[0049] In the second step, the processed pipe 4 is placed on the supporting wheel 101 of the rotating platform 1 of the coating equipment by means of a transfer tool, and the frequency conversion motor 102 connected to the supporting wheel 101 is started to drive the pipe to rotate. In this embodiment, the pipe 4 The caliber is DN1600 mm, and the rotation speed is 15rpm.

[0050] In the third step, start the heating torch 3 placed under the pipe 4 to preheat the outer wall of the pipe. In this embodiment, the temperature is controlled between 170° C. and 220° C., and the preheating takes 25 minutes.

[0051] The fourth step, after the preheat...

Embodiment 3

[0055] The ductile iron pipe lining process, the specific steps are:

[0056] In the first step, the inner wall of the rough pipe of the ductile iron pipe is ground and shot blasted. In this embodiment, the blank pipe material is a water-cooled metal type centrifugal ductile iron pipe.

[0057] In the second step, the processed pipe 4 is placed on the supporting wheel 101 of the rotating platform 1 of the coating equipment using a transfer tool, and the frequency conversion motor 102 connected to the supporting wheel 101 is started to drive the pipe 4 to rotate. The diameter of the pipe 4 is DN1000 mm, the speed is 18rpm.

[0058] The third step is to start the heating torch 3 placed under the pipe 4 to preheat the outer wall of the pipe, the temperature is controlled between 180°C and 230°C, and the preheating time is 20 minutes.

[0059] In the fourth step, after the preheating is completed, use the fabric trolley 2 to evenly distribute the ABS engineering plastic powder o...

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Abstract

The invention discloses a lining coating technology for a spheroidal graphite cast iron tube. The lining coating technology is characterized by comprising the following steps of 1, polishing the inner wall of a blank tube, and performing shot blasting; 2, putting the treated tube on a riding wheel of lining coating equipment through a transferring tool, and switching on a variable-frequency motor connected with the riding wheel to drive the tube to rotate at the rotating speed of less than or equal to 50rpm; 3, switching on a heating fire gun arranged below the tube to preheat the outer wall of the tube, and controlling the temperature between 140 DEG C and 230 DEG C; 4, after preheating is finished, uniformly distributing polyvinyl chloride or polyethylene or ABS (acrylonitrile butadiene styrene) engineering plastic or polytetrafluoroethylene or polypropylene powdered substances on the inner wall of the tube through a material distribution trolley to form a lining layer, and then cooling the lining layer, wherein in the cooling process, the tube is continuously rotated until the tube is completely cooled. The problem of the influence, which is caused by a fact that the lining layer prepared by an existing lining coating technology for the spheroidal graphite cast iron tube is easy to fall off, on normal mounting, the use of metering equipment, the sanitation of water quality and the like is solved; the manufacturing cost of the lining layer is reduced.

Description

technical field [0001] The invention relates to a processing method for ductile iron pipes, in particular to a lining process for ductile iron pipes. Background technique [0002] Ductile iron pipes are used for water transmission, and their inner linings are generally made of cement, epoxy ceramics, epoxy resin or polyurethane. The lining process has the following problems: [0003] 1. The existing technology has very strict requirements on the roundness of the socket of the pipe, which must be a perfect circle, otherwise the lining layer cannot be made on the basis of it, and the pipe laying and installation cannot be carried out even if it is barely made. In addition, the pipe deformation caused during transportation needs to be rounded before installation. The rounding process will cause the inner lining to fall off, and the installation work cannot be carried out normally. [0004] 2. The existing cement lining layer and epoxy ceramic lining layer rely on centrifugal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C7/04
CPCY02P70/10
Inventor 卫荣国
Owner 广西安钢永通铸管管业有限公司
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